[arin-ppml] ARIN-prop-127: Shared Transition Space for IPv4 Address Extension

Jack Bates jbates at brightok.net
Sat Jan 22 17:31:46 EST 2011

On 1/22/2011 4:22 PM, Mark Smith wrote:
> So, assuming the LS NAPT device is either a BRAS or CMTS, the size of
> the address space needed between the CPE and LS NAPT is dictated by the
> number of subscribers that can be realistically served by the BRAS/CMTS
> LS NAPT device or pool of devices. I'm pretty sure it isn't 4 194 304
> (/10), and more likely absolute maximum of 128K, and probably more
> commonly no more than 32K. Bear in mind that a new constraint on the

Remember, the limitations on LSN is the actual number of connections; 
however, you must still assign IPv4 addressing to all entities handled 
by the BRAS/CMTS. As IPv4 winds down, there will be (and many will want 
to prepare for it), larger portions of the network served by common 
LSNs. This would utilize considerably more address space between CPE and 
LSN while at the same time serving fewer connections.


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